0.2.1
-----
    This is a bugfix release.

  * Verify that exceptions don't leak to the outer scope;
  * Proper exceptions handling inside the library;
  * A memory leak was fixed;
  * Loosen dependecy constraints;
  * Implement a notion of Hints, additional parameters
    that allow the user to set additional options.

0.2
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  * Add ability to store arbitrary sockets used by the
    network-transport